﻿count = 0;
var a = function(n){
    count = count+1;
    if(n>2){
      return a(n-1)+a(n-2);
    } else {
      //console.log('count : ' +count);
      return 1;
    }
  }
start = Date.now();
resultrecu = a(50);
end = Date.now();
console.log(resultrecu + " : " + count + " : " + (end-start));